Sodium 2,4-diaminobenzenesulfonate is primarily used in the dye and pigment industry as an intermediate for the synthesis of azo dyes. These dyes are widely applied in textile coloring, providing vibrant and durable shades to fabrics, particularly for cellulose-based materials like cotton and linen. It is also utilized in the production of hair dyes, offering stable and long-lasting color results. In addition, this compound finds application in the manufacturing of organic pigments used in inks, paints, and plastics. Its sulfonate group contributes to the water solubility of the resulting dyes and compounds in various industrial synthesis processes.